If BCD follows in the footsteps of Bitcoin Cash and Bitcoin Gold, the holders of the new coin will “dump” them onto exchanges as soon as the opportunity arises. This will cause the value of BCD to drop rapidly.
Hopeful market manipulators will use the drop as an opportunity to secure large holdings of BCD that can later be used for “pump-and-dump” schemes. Some in the crypto community have suspected that Bitcoin Cash has become centralized through a similar process, and has in turn been used for manipulative purposes.
https://www.financemagnates.com/cryptocurrency/news/shine-crazy-blockchain-bitcoin-diamond-fork-now/